st8 [r2]=r8
st8 [r3]=r10
.work_pending:
- tbit.nz p6,p0=r31,TIF_SIGDELAYED // signal delayed from MCA/INIT/NMI/PMI context?
-(p6) br.cond.sptk.few .sigdelayed
- ;;
tbit.z p6,p0=r31,TIF_NEED_RESCHED // current_thread_info()->need_resched==0?
(p6) br.cond.sptk.few .notify
#ifdef CONFIG_PREEMPT
(pLvSys)br.cond.sptk.few .work_pending_syscall_end
br.cond.sptk.many .work_processed_kernel // don't re-check
-// There is a delayed signal that was detected in MCA/INIT/NMI/PMI context where
-// it could not be delivered. Deliver it now. The signal might be for us and
-// may set TIF_SIGPENDING, so redrive ia64_leave_* after processing the delayed
-// signal.
-
-.sigdelayed:
- br.call.sptk.many rp=do_sigdelayed
- cmp.eq p6,p0=r0,r0 // p6 <- 1, always re-check
-(pLvSys)br.cond.sptk.few .work_pending_syscall_end
- br.cond.sptk.many .work_processed_kernel // re-check
-
.work_pending_syscall_end:
adds r2=PT(R8)+16,r12
adds r3=PT(R10)+16,r12
}
return 0;
}
-
-/* Set a delayed signal that was detected in MCA/INIT/NMI/PMI context where it
- * could not be delivered. It is important that the target process is not
- * allowed to do any more work in user space. Possible cases for the target
- * process:
- *
- * - It is sleeping and will wake up soon. Store the data in the current task,
- * the signal will be sent when the current task returns from the next
- * interrupt.
- *
- * - It is running in user context. Store the data in the current task, the
- * signal will be sent when the current task returns from the next interrupt.
- *
- * - It is running in kernel context on this or another cpu and will return to
- * user context. Store the data in the target task, the signal will be sent
- * to itself when the target task returns to user space.
- *
- * - It is running in kernel context on this cpu and will sleep before
- * returning to user context. Because this is also the current task, the
- * signal will not get delivered and the task could sleep indefinitely.
- * Store the data in the idle task for this cpu, the signal will be sent
- * after the idle task processes its next interrupt.
- *
- * To cover all cases, store the data in the target task, the current task and
- * the idle task on this cpu. Whatever happens, the signal will be delivered
- * to the target task before it can do any useful user space work. Multiple
- * deliveries have no unwanted side effects.
- *
- * Note: This code is executed in MCA/INIT/NMI/PMI context, with interrupts
- * disabled. It must not take any locks nor use kernel structures or services
- * that require locks.
- */
-
-/* To ensure that we get the right pid, check its start time. To avoid extra
- * include files in thread_info.h, convert the task start_time to unsigned long,
- * giving us a cycle time of > 580 years.
- */
-static inline unsigned long
-start_time_ul(const struct task_struct *t)
-{
- return t->start_time.tv_sec * NSEC_PER_SEC + t->start_time.tv_nsec;
-}
-
-void
-set_sigdelayed(pid_t pid, int signo, int code, void __user *addr)
-{
- struct task_struct *t;
- unsigned long start_time = 0;
- int i;
-
- for (i = 1; i <= 3; ++i) {
- switch (i) {
- case 1:
- t = find_task_by_pid(pid);
- if (t)
- start_time = start_time_ul(t);
- break;
- case 2:
- t = current;
- break;
- default:
- t = idle_task(smp_processor_id());
- break;
- }
-
- if (!t)
- return;
- task_thread_info(t)->sigdelayed.signo = signo;
- task_thread_info(t)->sigdelayed.code = code;
- task_thread_info(t)->sigdelayed.addr = addr;
- task_thread_info(t)->sigdelayed.start_time = start_time;
- task_thread_info(t)->sigdelayed.pid = pid;
- wmb();
- set_tsk_thread_flag(t, TIF_SIGDELAYED);
- }
-}
-
-/* Called from entry.S when it detects TIF_SIGDELAYED, a delayed signal that
- * was detected in MCA/INIT/NMI/PMI context where it could not be delivered.
- */
-
-void
-do_sigdelayed(void)
-{
- struct siginfo siginfo;
- pid_t pid;
- struct task_struct *t;
-
- clear_thread_flag(TIF_SIGDELAYED);
- memset(&siginfo, 0, sizeof(siginfo));
- siginfo.si_signo = current_thread_info()->sigdelayed.signo;
- siginfo.si_code = current_thread_info()->sigdelayed.code;
- siginfo.si_addr = current_thread_info()->sigdelayed.addr;
- pid = current_thread_info()->sigdelayed.pid;
- t = find_task_by_pid(pid);
- if (!t)
- return;
- if (current_thread_info()->sigdelayed.start_time != start_time_ul(t))
- return;
- force_sig_info(siginfo.si_signo, &siginfo, t);
-}
mm_segment_t addr_limit; /* user-level address space limit */
int preempt_count; /* 0=premptable, <0=BUG; will also serve as bh-counter */
struct restart_block restart_block;
- struct {
- int signo;
- int code;
- void __user *addr;
- unsigned long start_time;
- pid_t pid;
- } sigdelayed; /* Saved information for TIF_SIGDELAYED */
};
#define THREAD_SIZE KERNEL_STACK_SIZE
#define TIF_NEED_RESCHED 2 /* rescheduling necessary */
#define TIF_SYSCALL_TRACE 3 /* syscall trace active */
#define TIF_SYSCALL_AUDIT 4 /* syscall auditing active */
-#define TIF_SIGDELAYED 5 /* signal delayed from MCA/INIT/NMI/PMI context */
#define TIF_POLLING_NRFLAG 16 /* true if poll_idle() is polling TIF_NEED_RESCHED */
#define TIF_MEMDIE 17
#define TIF_MCA_INIT 18 /* this task is processing MCA or INIT */
#define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME)
#define _TIF_SIGPENDING (1 << TIF_SIGPENDING)
#define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED)
-#define _TIF_SIGDELAYED (1 << TIF_SIGDELAYED)
#define _TIF_POLLING_NRFLAG (1 << TIF_POLLING_NRFLAG)
#define _TIF_MCA_INIT (1 << TIF_MCA_INIT)
#define _TIF_DB_DISABLED (1 << TIF_DB_DISABLED)
/* "work to do on user-return" bits */
-#define TIF_ALLWORK_MASK (_TIF_NOTIFY_RESUME|_TIF_SIGPENDING|_TIF_NEED_RESCHED|_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT|_TIF_SIGDELAYED)
+#define TIF_ALLWORK_MASK (_TIF_NOTIFY_RESUME|_TIF_SIGPENDING|_TIF_NEED_RESCHED|_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT)
/* like TIF_ALLWORK_BITS but sans TIF_SYSCALL_TRACE or TIF_SYSCALL_AUDIT */
#define TIF_WORK_MASK (TIF_ALLWORK_MASK&~(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT))
projects / linux-2.6 / commitdiff